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Finding the Fourth Proportional to 409.61, 614.50 and 135.72

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Solution

The fourth proportional to 409.61, 614.50 and 135.72 is: 203.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.61 : 614.50 = 135.72 : x
  2. Step 2: Convert to fraction form
    409.61/614.50 = 135.72/x
  3. Step 3: Cross multiply
    409.61x = 614.50 × 135.72
  4. Step 4: Simplify right side
    409.61x = 83,399.60
  5. Step 5: Solve for x
    x = 83,399.60/409.61
  6. Step 6: Final answer
    x = 203.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.